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ADC32RF45 input

Romain Pilard
Prodigy 140 points

Hello,

I have been going through the Evaluation Module User Guide and looking at the board picture, I am wondering why there are 2 baluns on each input channel? Is it a trick to get a wider input bandwidth? Are they of a same reference? And what is the impedance ratio of the baluns?

Thanks in advance for your comment.

Best regards,

Romain

  • 0
    TI__Mastermind 29220 points

    hi,

    The two back to back baluns are a trick to get better amplitude and phase balance between the two sides of the differential signal.  Since the balun is used to convert the single ended input from test equipment to differential, there is some residual imbalance in phase and/or amplitude between the two sides of the differential after the first balun.  The differential signal after the second balun is typically better matched.   There is a cost in that if we lose a dB of signal through one balun we lose another dB through the second also.  But then we just crank up the signal generator a bit more to compensate.     The baluns are 1:1 impedance ratio. 

    Regards,

    Richard P.